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King County Major Lakes Monitoring

For questions about the King County Major Lakes Monitoring Program, please contact Sally Abella (206) 477-4605, or Debra Bouchard (206) 477-4650.
Sail boat on Lake Washington picture by Dan Carey Children at the beach picture by Jonathan Frodge Great Blue Heron picture by Sarah Coughlin Oil slick on Lake Union picture by Sally Abella Water quality buoy picture by Hans Berge In memory of Sharon Walton In memory of Kari Osterhaug

Major Lakes Monitoring

We are committed to monitoring the water quality of the County's lakes to ensure their continued health, as well as the health of the public who utilize the lake's many resources. We invite you to learn more about our program by looking through the pages listed on the left. This site contains detailed graphs of water quality data, photographs of water sampling, and general information about the water quality of King County's lakes

Lake News

Green Lake Warning- Avoid Algae Scum Accumulations

While toxic algae has been found in accumulated scums along the shores of Green Lake, the lake is not closed and remains open to most activities. Look for signs posted along the shoreline. "IF IN DOUBT, STAY ALERT AND STAY OUT!"

Animal Safety Alert - Toxic Algae Blooms

Read this article from the to learn about toxic algae and your pet.